Question

Does data factory have self-hosted integration runtime for data flows

Answer 1

Self-hosted IR is an ADF pipeline construct that you can use with the Copy Activity to acquire or move data to and from on-prem or VM-based data sources and sinks. 

Stage the data first with a Copy, then Data Flow for transformation, and then a subsequent copy if you need to move that transformed data back to the on-prem store.

Comments

What options exist if company data is not allowed to be staged to the public network and yet there is still a need for simple transformation.  

My understanding is that a selff-hosted IR can invoke databricks to do transformation but this is suitable and cost effective for complex transformations

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I guess that is possible, For more details, check this out

https://docs.microsoft.com/en-us/azure/data-factory/create-self-hosted-integration-runtime#considerations-for-using-a-self-hosted-ir